vdpa: ifcvf: Fix spelling mistake in comments

There is a typo(does't) in comments.
It maybe 'doesn't' instead of 'does't'.
Signed-off-by: Zhang Jiaming <jiaming@nfschina.com>
Message-Id: <20220704024104.15535-1-jiaming@nfschina.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

drivers/vdpa/ifcvf/ifcvf_main.c

@@ -685,7 +685,7 @@ static struct vdpa_notification_area ifcvf_get_vq_notification(struct vdpa_devic
 }
 
 /*
- * IFCVF currently does't have on-chip IOMMU, so not
+ * IFCVF currently doesn't have on-chip IOMMU, so not
  * implemented set_map()/dma_map()/dma_unmap()
  */
 static const struct vdpa_config_ops ifc_vdpa_ops = {